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Topic: Leaving thermometer in carboy (Read 1812 times)

Is it a bad idea to leave a sanitized thermostat probe dangling down into my carboy while my beer ferments? I would like to just be able to turn it on and know what the fermentation temps are. I wonder if this will cause a seal problem with my blow off tube / airlock... Was wondering if anyone had thoughts on it.

There are also those Thermowells that are built into a rubber stopper and have a long SS sleeve that goes down into the fermenting beverage and gets a much more accurate reading that way (glass is a hell of an insulator).